For quick absorption and an energy boost, take
it sublingually. As for low thyroid, if you're on synthroid
for an extended period of time your thyroid is probably dead. If for a short time, if it's adjusted correctly, you shouldn't have low thyroid. The natural way to do this is by increasing iodine intake, through foods like kelp and fish and bladderwrack, but as I say, once you're on synthroid, that's your thyroid; the real one just stops functioning.